View ADR01_123509.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Ultracompact Precision 10 V/5 V/2.5 V Voltage References ADR01/ADR02/ADR03
FEATURES
Ultra compact SC70-5/TSOT-5 Low temperature coefficient 3 ppm/C Long term stability 50 ppm/1000 hr Line regulation 30 ppm/V Load regulation 50 ppm/mA Low noise 25 V p-p (0.1 Hz to 10 Hz) Low hysteresis 70 ppm typical Wide operating range ADR01 12 V to 40 V ADR02 7 V to 40 V ADR03 4.5 V to 40 V Quiescent current 1 mA max High output current 10 mA Wide temperature range -40C to +125C Industry standard REF01/REF02/REF03 compatible1
PIN CONFIGURATIONS
TEMP 1 GND
2
ADR01/ ADR02/ ADR03
5
TRIM
TOP VIEW VIN 3 (Not to Scale) 4 VOUT
Figure 1. 5-Lead SC-70/TSOT Surface Mount Packages
TP 1 VIN 2
ADR01/ ADR02/ ADR03
8 TP 7 NIC
TEMP 3 TOP VIEW 6 VOUT (Not to Scale) GND 4
5 TRIM
NIC = NO INTERNAL CONNECT TP = TEST PIN (DO NOT CONNECT)
Figure 2. 8-Lead SOIC Surface Mount Package
APPLICATIONS
Precision data acquisition systems High resolution converters Industrial process control systems Precision instruments PCMCIA cards
GENERAL DESCRIPTION
The ADR01, ADR02, and ADR03 are precision 10 V, 5 V, and 2.5 V band gap voltage references featuring high accuracy, high stability, and low power, housed in tiny SC70-5 and TSOT-5 packages. SOIC-8 versions of ADR01, ADR02, and ADR03 are available for industry standard REF01, REF02, and REF03 drop in replacement.1 The small footprint and wide operating range make them ideal for general-purpose and space constraint applications. With an external buffer and a simple resistor network, the TEMP terminal can be used for temperature sensing and approximation. A TRIM terminal is provided on the ADR01, ADR02, and ADR03 for fine adjustment of the output voltage. The ADR01, ADR02, and ADR03 are compact, low drift voltage references that provide an extremely stable output voltage from a wide supply voltage range. They are available in SC70-5, TSOT-5, and SOIC-8 packages with A and B grade selection. All parts are specified over the extended industrial (-40C to +125C) temperature range.
1
ADR01, ADR02, and ADR03 are component-level compatible with REF01, REF02, and REF03, respectively. No guarantees for system-level compatibility are implied. SOIC-8 versions of ADR01/ADR02/ADR03 are pin-to-pin compatible with SOIC-8 versions of REF01/REF02/REF03, respectively, with the additional temperature monitoring function.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 (c) 2003 Analog Devices, Inc. All rights reserved.
ADR01/ADR02/ADR03
TABLE OF CONTENTS
Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 6 Parameter Definitions ...................................................................... 7 Typical Performance Characteristics ............................................. 8 Theory of Operation ...................................................................... 14 Introduction................................................................................ 14 Applying the ADR01/ADR02/ADR03..................................... 14 Applications ................................................................................ 15 Outline Dimensions ....................................................................... 18 Ordering Guide............................................................................... 20
REVISION HISTORY
Revision B 2/03--Data Sheet Changed from REV. A to REV. B. Added ADR03 .................................................................Universal Added TSOT-5 (UJ) Package ........................................Universal Updated OUTLINE DIMENSIONS ........................................ 18 Revision A 12/02--Data Sheet Changed from REV. 0 to REV. A. Changes to Features ..................................................................... 1 Changes to GENERAL DESCRIPTION ................................... 1 Table I deleted............................................................................... 1 Changes to ADR01 SPECIFICATIONS.................................... 2 Changes to ADR02 SPECIFICATIONS.................................... 3 Changes to ABSOLUTE MAXIMUM RATINGS ................... 4 Changes to ORDERING GUIDE ............................................... 4 Updated OUTLINE DIMENSIONS ........................................ 12
Rev. B | Page 2 of 20
ADR01/ADR02/ADR03
SPECIFICATIONS
Table 1. ADR01--Electrical Characteristics (VIN = 12 V to 40 V, TA = 25C, unless otherwise noted.)
Parameter Output Voltage Initial Accuracy Output Voltage Initial Accuracy Symbol VO VOERR VO VOERR Conditions A Grade A Grade B Grade B Grade A Grade, SOIC-8, -40C < TA < +125C A Grade, TSOT-5, -40C < TA < +125C A Grade, SC70-5, -40C < TA < +125C B Grade, SOIC-8, -40C < TA < +125C B Grade, TSOT-5, -40C < TA < +125C B Grade, SC70-5, -40C < TA < +125C 2 VIN = 15 V to 40 V, -40 < TA < +125C ILOAD = 0 mA to 10 mA, -40 < TA < +125C No Load, -40 < TA < +125C 0.1 Hz to 10 Hz 1 kHz 1,000 Hours fIN = 10 kHz 7 40 0.65 25 510 4 50 70 -75 30 550 1.96 30 70 1 3 9.995 10.000 Min 9.990 Typ 10.000 Max 10.010 10 0.1 10.005 5 0.05 10 25 25 3 9 9 Unit V mV % V mV % ppm/C ppm/C ppm/C ppm/C ppm/C ppm/C V ppm/V ppm/mA mA V p-p nV/Hz s ppm ppm dB mA mV mV/C
Temperature Coefficient
TCVO
1
Supply Voltage Headroom Line Regulation Load Regulation Quiescent Current Voltage Noise Voltage Noise Density Turn-On Settling Time Long Term Stability1 Output Voltage Hysterisis Ripple Rejection Ratio Short Circuit to GND Voltage Output at TEMP Pin Temperature Sensitivity
VIN - VO VO/VIN VO/ILOAD IIN eN p-p eN tR VO VO_HYS RRR ISC VTEMP TCVTEMP
1
The long term stability specification is noncumulative. The drift in subsequent 1,000 hour periods is significantly lower than in the first 1,000 hour period. Rev. B | Page 3 of 20
ADR01/ADR02/ADR03
Table 2. ADR02--Electrical Characteristics (VIN = 7 V to 40 V, TA = 25C, unless otherwise noted.)
Parameter Output Voltage Initial Accuracy Output Voltage Initial Accuracy Symbol VO VOERR VO VOERR Conditions A Grade A Grade B Grade B Grade A Grade, SOIC-8, -40C < TA < +125C A Grade, TSOT-5, -40C < TA < +125C A Grade, SC70-5, -40C < TA < +125C B Grade, SOIC-8, -40C < TA < +125C B Grade, TSOT-5, -40C < TA < +125C B Grade, SC70-5, -40C < TA < +125C 2 VIN = 10 V to 40 V, -40 < TA < +125C ILOAD = 0 mA to 10 mA, -40 < TA < +125C No Load, -40 < TA < +125C 0.1 Hz to 10 Hz 1 kHz 1,000 Hours fIN = 10 kHz 7 40 0.65 25 230 4 50 70 -75 30 550 1.96 30 70 1 3 4.997 5.000 Min 4.995 Typ 5.000 Max 5.005 5 0.1 5.003 3 0.06 10 25 25 3 9 9 Unit V mV % V mV % ppm/C ppm/C ppm/C ppm/C ppm/C ppm/C V ppm/V ppm/mA mA V p-p nV/Hz s ppm ppm dB mA mV mV/C
Temperature Coefficient
TCVO
1
Supply Voltage Headroom Line Regulation Load Regulation Quiescent Current Voltage Noise Voltage Noise Density Turn-On Settling Time Long Term Stability1 Output Voltage Hysterisis Ripple Rejection Ratio Short Circuit to GND Voltage Output at TEMP Pin Temperature Sensitivity
VIN - VO VO/VIN VO/ILOAD IIN eN p-p eN tR VO VO_HYS RRR ISC VTEMP TCVTEMP
1
The long term stability specification is noncumulative. The drift in subsequent 1,000 hour periods is significantly lower than in the first 1,000 hour period. Rev. B | Page 4 of 20
ADR01/ADR02/ADR03
Table 3. ADR03--Electrical Characteristics (VIN = 4.5 V to 40 V, TA = 25C, unless otherwise noted.)
Parameter Output Voltage Initial Accuracy Output Voltage Initial Accuracy Symbol VO VOERR VO VOERR Conditions A Grade A Grade B Grade B Grade A Grade, SOIC-8, -40C < TA < +125C A Grade, TSOT-5, -40C < TA < +125C A Grade, SC70-5, -40C < TA < +125C B Grade, SOIC-8, -40C < TA < +125C B Grade, TSOT-5, -40C < TA < +125C B Grade, SC70-5, -40C < TA < +125C 2 VIN = 5 V to 18 V, -40 < TA < +125C ILOAD = 0 mA to 10 mA, -40 < TA < +125C No Load, -40 < TA < +125C 0.1 Hz to 10 Hz 1 kHz 1,000 Hours fIN = 10 kHz 7 25 0.65 25 105 4 50 70 -75 30 1.96 30 50 1 3 2.4975 2.5000 Min 2.495 Typ 2.500 Max 2.505 5 0.2 2.5025 2.5 0.01 10 25 25 3 9 9 Unit V mV % V mV % ppm/C ppm/C ppm/C ppm/C ppm/C ppm/C V ppm/V ppm/mA mA V p-p nV/Hz s ppm ppm dB mA mV/C
Temperature Coefficient
TCVO
1
Supply Voltage Headroom Line Regulation Load Regulation Quiescent Current Voltage Noise Voltage Noise Density Turn-On Settling Time Long Term Stability1 Output Voltage Hysterisis Ripple Rejection Ratio Short Circuit to GND Temperature Sensitivity
VIN - VO VO/VIN VO/ILOAD IIN eN p-p eN tR VO VO_HYS RRR ISC TCVTEMP
1
The long term stability specification is noncumulative. The drift in subsequent 1,000 hour periods is significantly lower than in the first 1,000 hour period. Rev. B | Page 5 of 20
ADR01/ADR02/ADR03
ABSOLUTE MAXIMUM RATINGS
Table 4. Absolute Maximum Ratings (at 25C, unless otherwise noted)
Parameter Supply Voltage Output Short-Circuit Duration to GND Storage Temperature Range Operating Temperature Range Junction Temperature Range: KS, UJ, R Packages Lead Temperature Range (Soldering, 60 Sec) Rating 18 V Indefinite -65C to +150C -40C to +125C -65C to +150C
1
Table 5. Thermal Resistance
Package Type SC70-5 (KS-5) TSOT-5 (UJ-5) SOIC-8 (R-8) JA1 376 230 130 JC 189 146 43 Unit C/W C/W C/W
300C
JA is specified for the worst-case conditions, i.e., JA is specified for device soldered in circuit board for surface mount packages.
Rev. B | Page 6 of 20
ADR01/ADR02/ADR03
PARAMETER DEFINITIONS
TEMPERATURE COEFFICIENT
The change of output voltage with respect to operating temperature changes normalized by the output voltage at 25C. This parameter is expressed in ppm/C and can be determined by the following equation:
THERMAL HYSTERISIS
Defined as the change of output voltage after the device is cycled through temperature from +25C to -40C to +125C and back to +25C. This is a typical value from a sample of parts put through such a cycle.
TCVO [ppm/C] =
where,
VO (T2 ) - VO (T1 ) x 10 6 VO (25C) x (T2 - T1 )
VO _ HYS = VO (25C) - VO _ TC VO _ HYS [ppm] =
where,
VO (25C) = VO at 25C VO (T1 ) = VO at temperature 1 VO (T2 ) = VO at temperature 2
VO (25C) - VO _ TC x 10 6 VO (25C)
VO (25C) = VO at 25C VO _ TC = VO at 25C after temperatur e cycle at + 25C
to - 40C to + 125C and back to + 25C
LINE REGULATION
The change in output voltage due to a specified change in input voltage. This parameter accounts for the effects of self-heating. Line regulation is expressed in either percent per volt, partsper-million per volt, or microvolts per volt change in input voltage.
NOTES
Input Capacitor
Input capacitors are not required on the ADR01/ADR02/ ADR03. There is no limit for the value of the capacitor used on the input, but a 1 F to 10 F capacitor on the input will improve transient response in applications where the supply suddenly changes. An additional 0.1 F in parallel will also help reducing noise from the supply.
LOAD REGULATION
The change in output voltage due to a specified change in load current. This parameter accounts for the effects of self-heating. Load regulation is expressed in either microvolts per milliampere, parts-per-million per milliampere, or ohms of dc output resistance.
Output Capacitor
The ADR01/ADR02/ADR03 do not require output capacitors for stability under any load condition. An output capacitor, typically 0.1 F, will filter out any low level noise voltage and will not affect the operation of the part. On the other hand, the load transient response can be improved with an additional 1F to 10 F output capacitor in parallel. A capacitor here will act as a source of stored energy for sudden increase in load current. The only parameter that will degrade by adding an output capacitor is the turn-on time, and it depends on the size of the capacitor chosen.
LONG TERM STABILITY
Typical shift of output voltage at 25C on a sample of parts subjected to a test of 1,000 hours at 25C: VO = VO (t 0 ) - VO (t 1 )
VO [ppm] =
where,
VO (t 0 ) - VO (t 1 ) x 10 6 VO (t 0 )
VO (t 0 ) = VO at 25C at time 0 VO (t 1 ) = VO at 25C after 1,000 hours operation at 25C
Rev. B | Page 7 of 20
ADR01/ADR02/ADR03
TYPICAL PERFORMANCE CHARACTERISTICS
10.010
2.502
10.005
2.501
10.000
VOUT - V
VOUT - V
-40 0 25 o TEMPERATURE - C 85 125
2.500
9.995
9.990
2.499
9.985
2.498 -40 -25
-10
5
35 20 65 50 o TEMPERATURE - C
80
95
110
125
Figure 3. ADR01 Typical Output Voltage vs. Temperature
Figure 5. ADR03 Typical Output Voltage vs. Temperature
5.008
0.8
SUPPLY CURRENT - mA
5.004
0.7
o +125 C
VOUT - V
5.000
0.6
+25oC -40oC
4.996
0.5
4.992
0.4 -40 0 25 TEMPERATURE - oC 85 125 12 16 20 24 28 32 INPUT VOLTAGE - V 36 40
Figure 4. ADR02 Typical Output Voltage vs. Temperature
Figure 6. ADR01 Supply Current vs. Input Voltage
Rev. B | Page 8 of 20
ADR01/ADR02/ADR03
0.8 40 IL = 0 TO 10mA 30 0.7 +125oC LOAD REGULATION - ppm/mA VIN = 40V 20 10 0 VIN = 14V -10 -20 -30 0.4 8 12 16 20 24 28 32 36 40 INPUT VOLTAGE - V -40 -40
INPUT CURRENT - mA
0.6
+25oC -40oC
0.5
0
25
50
o
85
125
TEMPERATURE - C
Figure 7. ADR02 Supply Current vs. Input Voltage
Figure 9. ADR01 Load Regulation vs. Temperature
0.85 0.80 0.75 0.70 0.65 0.60 0.55 0.50 0.45 0.40
5 10 15 20 30 25 INPUT VOLTAGE - V 35 40 +125 C +25 C
o o
50 IL = 0 TO 5mA 40
LOAD REGULATION - ppm/mA
SUPPLY CURRENT - mA
30 VIN = 40V 20 10 0 VIN = 8V
-40oC
-10 -20 -40 0 25 TEMPERATURE - oC 85 125
Figure 8. ADR03 Supply Current vs. Input Voltage
Figure 10. ADR02 Load Regulation vs. Temperature
Rev. B | Page 9 of 20
ADR01/ADR02/ADR03
60
8 VIN = 8V TO 40V
50
LOAD REGULATION - ppm/mA
LINE REGULATION - ppm/V
7V 40 40V 30
4
0
20
-4
10
0 -40 -25
-10
5
35 20 65 50 o TEMPERATURE - C
80
95
110
125
-8 -40
0
25 TEMPERATURE - oC
85
125
Figure 11. ADR03 Load Regulation vs. Temperature
Figure 13. ADR02 Line Regulation vs. Temperature
2 VIN = 14V TO 40V 0
4
LINE REGULATION - ppm/mV
LINE REGULATION - ppm/V
2
-2
-4
0
-6
-2
-8
-10 -40
0
25 o TEMPERATURE - C
85
125
-4 -40
-25
-10
5
35 50 65 20 TEMPERATURE - oC
80
95
110
125
Figure 12. ADR01 Line Regulation vs. Temperature
Figure 14. ADR03 Line Regulation vs. Temperature
Rev. B | Page 10 of 20
ADR01/ADR02/ADR03
5
6
DIFFERENTIAL VOLTAGE - V
DIFFERENTIAL VOLTAGE - V
4
5
4 +125oC +25 C 2 -40 C
o o
3 +125 C 2
o
3
-40 C
o
1
+25oC
1 0
0 0 2 4 6 LOAD CURRENT - mA 8 10
0
2
4 6 LOAD CURRENT - mA
8
10
Figure 15. ADR01 Minimum Input-Output Voltage Differential vs. Load Current
Figure 17. ADR02 Minimum Input-Output Voltage Differential vs. Load Current
8
0.70 TA = 25 C
o
DIFFERENTIAL VOLTAGE - V
QUIESCENT CURRENT - mA
8 10
0.65
4 +125 C -40oC 2
o
0.60
0.55
+25 C 0 0.50 0 2 4 6 LOAD CURRENT - mA 0 2 4 6 LOAD CURRENT - mA 8 10
o
Figure 16. ADR02 Minimum Input-Output Voltage Differential vs. Load Current
Figure 18. ADR01 Quiescent Current vs. Load Current
Rev. B | Page 11 of 20
ADR01/ADR02/ADR03
VIN 2V/DIV
40V/DIV
VOUT 5V/DIV
NO LOAD CAP NO INPUT CAP
TIME - 4.00ms/DIV
TIME - 2.00ms/DIV
Figure 19. ADR02 Typical Noise Voltage 0.1 Hz to 10 Hz
Figure 21. ADR02 Line Transient Response
NO LOAD CAP VIN 5V/DIV
40V/DIV
VOUT 100mV/DIV
TIME - 4.00ms/DIV
TIME - 1.00ms/DIV
Figure 20. ADR02 Typical Noise Voltage 10 Hz to 10 KHz
Figure 22. ADR02 Load Transient Response
Rev. B | Page 12 of 20
ADR01/ADR02/ADR03
CLOAD = 100nF VIN 5V/DIV CL = 0.01F NO INPUT CAP VIN 10V/DIV
VOUT 100mV/DIV VOUT 5V/DIV
TIME - 1.00ms/DIV
TIME - 4s/DIV
Figure 23. ADR02 Load Transient Response
Figure 26. ADR02 Turn-Off Response
VIN 10V/DIV
VIN 10V/DIV
CIN = 0.01F NO LOAD CAP
CL = 0.01F NO INPUT CAP
VOUT 5V/DIV
VOUT 5V/DIV
TIME - 4s/DIV
Figure 24. ADR02 Turn-On Response
Figure 27. ADR02 Turn-On Response
CIN = 0.01F NO LOAD VIN 10V/DIV
VOUT 5V/DIV
TIME - 4s/DIV
Figure 25. ADR02 Turn-On Response
Rev. B | Page 13 of 20
ADR01/ADR02/ADR03
THEORY OF OPERATION
Introduction
The ADR01/ADR02/ADR03 represent improved versions of the industry standard REF01/REF02/REF03 10 V, 5 V, and 2.5 V voltage references with higher precision, lower drift, and smaller footprint. The SOIC-8 version of the ADR01/ADR02/ADR03 is a drop-in replacement of the REF01/REF02/REF03 sockets with improved cost and performance. The ADR01/ADR02/ADR03 are standard band gap references. The band gap cell contains two NPN transistors (Q18 and Q19) that differ in emitter area by 2x. The difference in their VBE produces a Proportional to Absolute Temperature (PTAT) current in R14, when combined with the VBE of Q19, produces a band gap voltage VBG that is almost constant in temperature. With an internal op amp and the feedback network of R5 and R6, VO is set precisely at 10 V, 5 V, and 2.5 V for the ADR01, ADR02, and ADR03, respectively. Precision laser trimming of the resistors and other proprietary circuit techniques are used to further enhance the initial accuracy, temperature curvature, and drift performance of the ADR01/ADR02/ADR03.
VIN R1 Q1 R2 Q2 Q3 R3 Q23 Q7 Q8 Q9 D1 D2 Q4 D3 R12 R13 Q12 Q13 I1 Q14 Q15 2X Q18 1X Q19 Q16 Q20 R32 R17 R11 R24 R41 R42 GND Q17 R6
VIN
Applying the ADR01/ADR02/ADR03
The ADR01/ADR02/ADR03 can be used without any external components to achieve the specified performance. Because of the internal op amp amplifying the band gap cell to 10 V/5 V/2.5 V, power supply decoupling will help the transient response of the ADR01/ADR02/ADR03. As a result, a 0.1 F ceramic type decoupling capacitor should be applied as close as possible to the input and output pins of the device. An optional 1 F to 10 F bypass capacitor can also be applied at the VIN node to maintain the input under transient disturbance.
U1
ADR01/ ADR02/ ADR03
VIN C1 0.1F VIN VOUT VO C2 0.1F TEMP TRIM GND
Figure 29. Basic Configuration
OUTPUT ADJUSTMENT
The ADR01/ADR02/ADR03 trim terminal can be used to adjust the output voltage over a nominal voltage. This feature allows a system designer to trim system errors by setting the reference to a voltage other than 10 V/5 V/2.5 V. For finer adjustment, a series resistor of 470 k can be added. With the configuration shown in Figure 30, the ADR01 can be adjusted from 9.70 V to 10.05 V, the ADR02 can be adjusted from 4.95 V to 5.02 V, and the ADR03 can be adjusted from 2.3 V to 2.8 V. Adjustment of the output does not significantly affect the temperature performance of the device, provided the temperature coefficients of the resistors are relatively low.
U1
R4
Q10
VO C1 R5
VBG
R20
TEMP
R27
TRIM
R14
ADR01/ ADR02/ ADR03
VIN VOUT R1 470k TEMP TRIM GND
VO pot 10k
Figure 28. Simplified Schematic Diagram
R2 1k
The PTAT voltage is made available at the TEMP pin of the ADR01/ADR02/ADR03. It has a stable 1.96 mV/C temperature coefficient, such that users can estimate the temperature change of the device by knowing the voltage change at the TEMP pin.
Figure 30. Optional Trim Adjustment
Rev. B | Page 14 of 20
ADR01/ADR02/ADR03
TEMPERATURE MONITORING
As described previously, the ADR01/ADR02/ADR03 provide a TEMP output (Pin 3) that varies linearly with temperature. This output can be used to monitor the temperature change in the system. The voltage at VTEMP is approximately 550 mV at 25C, and the temperature coefficient is approximately 1.96 mV/C (see Figure 31).
0.80 0.75 0.70 VIN = 15V SAMPLE SIZE = 5
Applications
NEGATIVE REFERENCE
Without using any matching resistors, a negative reference can be configured as shown in Figure 33. For the ADR01, the voltage difference between VOUT and GND is 10 V. Since VOUT is at virtual ground, U2 will close the loop by forcing the GND pin to be the negative reference node. U2 should be a precision op amp with a low offset voltage characteristic.
U1
ADR01/ ADR02/ ADR03
5V TO 15V VIN VOUT +15V U2 -VREF TEMP TRIM GND
VTEMP /T 1.96mV/ oC
0.65
VTEMP - V
0.60 0.55 0.50 0.45 0.40 -50
OP1177
V-
V+
-15V
-25 0 25 50 75 100 125
Figure 33. Negative Reference
TEMPERATURE - oC
Figure 31. Voltage at TEMP Pin vs. Temperature
LOW COST CURRENT SOURCE
Unlike most references, the ADR01/ADR02/ADR03 employ an NPN Darlington in which the quiescent current remains constant with respect to the load current (see Figure 18). As a result, a current source can be configured as shown in Figure 34 where ISET = (VOUT - VL)/RSET. IL is simply the sum of ISET and IQ. Although simple, IQ varies typically from 0.55 mA to 0.65 mA, limiting this circuit to general purpose applications.
VIN IIN
A voltage change of 39.2 mV at the TEMP pin corresponds to a 20C change in temperature. The TEMP function is provided as a convenience rather than a precise feature. Since the voltage at the TEMP node is acquired from the band gap core, current pulling from this pin will have a significant effect on VOUT. Care must be taken to buffer the TEMP output with a suitable low bias current op amp, such as the AD8601, AD820, or OP1177 (all of which would result in less than a 100 V change in VOUT) (see Figure 32). Without buffering, even tens of mircoamps drawn from the TEMP pin can cause VOUT to fall out of specification.
U1 15V VIN VTEMP o 1.9mV/ C U2 V+ V-
ADR01/ ADR02/ ADR03
GND
VOUT
RSET
ISET = 10V/RSET
ADR01/ ADR02/ ADR03
VIN VOUT VO TEMP TRIM GND
VL IQ 0.6mA RL IL = ISET + IQ
OP1177
Figure 34. Low Cost Current Source Figure 32. Temperature Monitoring
Rev. B | Page 15 of 20
ADR01/ADR02/ADR03
PRECISION CURRENT SOURCE WITH ADJUSTABLE OUTPUT
A precision current source, on the other hand, can be implemented with the circuit shown in Figure 35. By adding a mechanical or digital potentiometer, this circuit becomes an adjustable current source. If a digital potentiometer is used, the load current is simply the voltage across terminals B-to-W of the digital potentiometer divided by RSET, According to Equation 2, R3 can be used to set the sensitivity. R3 can in fact be made as small as necessary to achieve the current needed within U4 output current driving capability. On the other hand, other resistors can be kept high to conserve power.
5V U1 15V VIN VOUT 10V U2 VDD RF +15V IO V+ U3 VX V- -15V 0V TO -10V R2 R1 15k 150k VP C1 10pF U4 R2' 15k R1' VN 150k LOAD 500 4-20mA VO R3' 50 VL R3 50
TEMP TRIM GND
VREF AD5544 IO GND
IL =
V REF x D R SET
(1)
AD8512
DIGITAL INPUT CODE 20%-100% FULL SCALE U1 = ADR01/ADR02/ADR03, REF01 U2 = AD5543/AD5544/AD5554 U3, U4 = AD8512
AD8512
where D is the decimal equivalent of the digital potentiometer input code.
U1
ADR01/ ADR02/ ADR03
+12V VIN VOUT TEMP TRIM GND
0 TO (5V + VL) B AD5201 100k A +12V U2 RSET 1k W
Figure 36. Programmable 4-20 mA Transmitter
In this circuit, the AD8512 is capable of delivering 20 mA of current, and the voltage compliance approaches 15 V. The Howland Current Pump yields a potentially infinite output impedance, which is highly desirable, but resistance matching is critical in this application. The output impedance can be determined using Equation 3. As can be seen by this equation, if the resistors are perfectly matched, ZO is infinite. On the other hand, if they are not matched, ZO will be either positive or negative. If the latter is true, oscillation may occur. For this reason, a capacitor C1, in the range of 1 pF to 10 pF should be connected between VP and the output terminal of U4, to filter any oscillation.
OP1177
-5V TO VL V- RL VL 1k IL
V+
-12V
Figure 35. Programmable 0-to-5mA Current Source
To optimize the resolution of this circuit, dual supply op amps should be used, because the ground potential of ADR02 can swing from -5 V at zero scale to VL at full scale of the potentiometer setting.
ZO =
Vt R1 = I t R1R 2 - 1 R1R 2
(3)
PROGRAMMABLE 4-20 mA CURRENT TRANSMITTER
Because of their precision, adequate current handling, and small footprint, the ADR01/ADR02/ADR03 are suitable as the reference sources for many high performance converter circuits. One of these applications is the multichannel 16-bit 4-20 mA current transmitter in the industrial control market (see Figure 36). This circuit employs a Howland Current Pump at the output, which yields better efficiency, less component count, and higher voltage compliance than the conventional design with op amps and MOSFETs. In this circuit, if the resistors are matched such that R1 = R1, R2 = R2, R3 = R3, the load current is:
In this circuit, an ADR01 provides the stable 10.000 V reference for the AD5544 quad 16-bit DAC. The resolution of the adjustable current is 0.3 A/step, and the total worst-case INL error is merely 4 LSB. Such error is equivalent to 1.2 A or 0.006% system error, which is well below most systems' requirements. The result is shown in Figure 37 with measurement taken at 25C and 70C: total system error of 4 LSB at both 25C and 70C.
IL =
(R2 + R3) R1 VREF x D x 2N R3
(2)
where D is similarly the decimal equivalent of the DAC input code and N is the number of bits of the DAC.
Rev. B | Page 16 of 20
ADR01/ADR02/ADR03
5 RL = 500 IL = 0 TO 20mA 4
PRECISION BOOSTED OUTPUT REGULATOR
A precision voltage output with boosted current capability can be realized with the circuit shown in Figure 38. In this circuit, U2 forces VO to be equal to VREF by regulating the turn-on of N1, thereby making the load current furnished by VIN. In this configuration, a 50 mA load is achievable at VIN of 15 V. Moderate heat will be generated on the MOSFET, and higher current can be achieved with a replacement of a larger device. In addition, for a heavy capacitive load with a fast edging input signal, a buffer should be added at the output to enhance the transient response.
49152 57344 65536
3
INL - LSB
2 70 C 1
o
25 C
o
0
-1
0
8192
16384
24576 32768 40960 CODE - Decimal
N1 VIN VO
Figure 37. Result of Programmable 4-20 mA Current Transmitter
U1
ADR01/ ADR02/ ADR03
VIN VOUT TEMP TRIM GND
15V 2N7002 V+ V-
RL 200
CL 1F
OP1177
U2
Figure 38. Precision Boosted Output Regulator
Rev. B | Page 17 of 20
ADR01/ADR02/ADR03
OUTLINE DIMENSIONS
2.00 BSC
5
4
1.25 BSC
1 2 3
2.10 BSC
PIN 1 1.00 0.90 0.70 0.10 0.00 0.30 0.15
0.65 BSC 1.10 MAX 0.22 0.08 SEATING PLANE 0.46 0.36 0.26
COMPLIANT TO JEDEC STANDARDS MO-203AA
Figure 39. 5-Lead [SC70] Plastic Surface-Mount Package (KS-5) Dimensions Shown in Millimeters
Figure 40. 5-Lead [TSOT-5] Thin Small Outline Transistor Package (UJ-5) Dimensions Shown in Millimeters
Rev. B | Page 18 of 20
ADR01/ADR02/ADR03
5.00 (0.1968) 4.80 (0.1890)
8 1 5
4.00 (0.1574) 3.80 (0.1497)
6.20 (0.2440)
4 5.80 (0.2284)
1.27 (0.0500) BSC
0.25 (0.0098) 0.10 (0.0040)
1.75 (0.0688) 1.35 (0.0532)
0.50 (0.0196) x 45 0.25 (0.0099)
O
COPLANARITY SEATING 0.10 PLANE
0.51 (0.0201) 0.33 (0.0130)
8 0.25 (0.0098) 0 0.19 (0.0075)
O O
1.27 (0.0500) 0.41 (0.0160)
COMPLIANT TO JEDEC STANDARDS MS-012AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
Figure 41. 8-Lead [SOIC] Standard Small Outline Package (R-8) Dimensions Shown in Millimeters and (Inches)
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although these products feature proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
Rev. B | Page 19 of 20
ADR01/ADR02/ADR03
ORDERING GUIDE
Table 6.
ADR01/ADR02/ADR03 Product ADR01AR ADR01AR-REEL7 ADR01BR ADR01BR-REEL7 ADR01AUJ-REEL7 ADR01BUJ-REEL7 ADR01AKS-REEL7 ADR01BKS-REEL7 ADR02AR ADR02AR-REEL7 ADR02BR ADR02BR-REEL7 ADR02AUJ-REEL7 ADR02BUJ-REEL7 ADR02AKS-REEL7 ADR02BKS-REEL7 ADR03AR ADR03AR-REEL7 ADR03BR ADR03BR-REEL7 ADR03AUJ-REEL7 ADR03BUJ-REEL7 ADR03AKS-REEL7 ADR03BKS-REEL7 Output Voltage VO (V) 10 10 10 10 10 10 10 10 5 5 5 5 5 5 5 5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 Initial Accuracy (mV) (%) 10 0.1 10 0.1 5 0.05 5 0.05 10 0.1 5 0.05 10 0.1 5 0.05 5 0.1 5 0.1 3 0.06 3 0.06 5 0.1 3 0.06 5 0.1 3 0.06 5 0.2 5 0.2 2.5 0.1 2.5 0.1 5 0.2 2.5 0.1 5 0.1 2.5 0.1 Temperature Coefficient (ppm/C) 10 10 3 3 25 9 25 9 10 10 3 3 25 9 25 9 10 10 3 3 25 9 25 9 Package Description SOIC-8 SOIC-8 SOIC-8 SOIC-8 TSOT-5 TSOT-5 SC70 SC70 SOIC-8 SOIC-8 SOIC-8 SOIC-8 TSOT-5 TSOT-5 SC70 SC70 SOIC-8 SOIC-8 SOIC-8 SOIC-8 TSOT-5 TSOT-5 SC70 SC70 Package Option R-8 R-8 R-8 R-8 UJ-5 UJ-5 KS-5 KS-5 R-8 R-8 R-8 R-8 UJ-5 UJ-5 KS-5 KS-5 R-8 R-8 R-8 R-8 UJ-5 UJ-5 KS-5 KS-5 Top Mark1 ADR01 ADR01 ADR01 ADR01 R8A R8B R8A R8B ADR02 ADR02 ADR02 ADR02 R9A R9B R9A R9B ADR03 ADR03 ADR03 ADR03 RFA RFB RFA RFB No. of Parts per Reel 98 1,000 98 1,000 3,000 3,000 3,000 3,000 98 1,000 98 1,000 3,000 3,000 3,000 3,000 98 1,000 98 1,000 3,000 3,000 3,000 3,000 Temperature Range (C) -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125
1
First line shows part number ADR0x. Second line shows A or B for the grade, with the YYMM date code. Third line shows the lot number.
(c) 2003 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. Printed in the U.S.A. C02747-0-2/03(B)
Rev. B | Page 20 of 20

▲Up To Search▲

Price & Availability of ADR01

	To Download ADR01 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .